Monitoring Technique
VARIMETER
Motor Load Monitor
MK 9397N, MH 9397
0273607
Your Advantage
• Preventive maintenance
• For a evaluate time
• Quicker fault locating
• Precise and reliable
• Overload detection, as option also with prewarning
• Can also be used for underload monitoring
• Simple adjustment and fault diagnostics
• Space and cost saving
MK 9397N
MH 9397
Product description
The Load monitor MK9397 and MH9397 of the varimeter family monitor
reliably the load of motors as well as the function of 3 phase electrical users.
If the measured value falls under or goes over the adjusted settings the
corresponding output relay is energised. To avoid unnecessary tripping a
response delay tv can be adjusted between 0 and 10 s. LEDs show the
status of the output relays.
Function Diagram
Features
• According to EN 60255-1
• Active power measuring
• Relay output
MK 9397N: 1 changeover contact
MH 9397: 1 changeover contact each for overload and prewarning
• On delay
• Closed circuit operation
• As option open circuit operation
• As option with plugable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• MK 9397N: Width 22,5 mm
MH 9397: Width 45 mm
Approvals and Markings
UH
A1/A2
P
Application
The load monitor is suitable to monitor industrial motors with variable load
as well as to monitor the correct function of electrical users. The units can
detect in time wearing or failures on machines and tools. So maintenance
can be carried out before a plant stops.
[Watt]
P2
Function
The load monitor monitors the effective power of electrical consumers. As
the current is only measured in one phase a symmetric load in a 3 phases
is assumed. as it is usual with motors. The setting value is adjusted with
potentiometers, the range selection by rotational switches. The MH 9397
has 2 response values (e.g. for prewarning).
P1
11-14
11-12
LED
grün
tv
21-24
21-22
LED
grün
tv
M10141
All technical data in this list relate to the state at the moment of edition. We reserve the right for
technical improvements and changes at any time.
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Circuit Diagrams
Setting
A1
A2
+
A2
A1
k L1/i L2 L3
k L1/i
L2
L3
11
11
21
12 14
12 14
22 24
11 12 14
11 12 14
M10139
MH 9397
Connection Terminals
Terminal designation
fine adjustment
8 ranges adjustable:
0 ... 1 kW
1 ... 2 kW
2 ... 3 kW
..
.
7 ... 8 kW
2 rotational switches for P2
rotary switch 3:
rotary switch 4:
fine adjustment
8 ranges adjustable:
0 ... 1 kW
1 ... 2 kW
2 ... 3 kW
..
.
7 ... 8 kW
21 22 24
M10140
MK 9397N
2 rotational switches for P1
rotary switch 1:
rotary switch 2:
Signal designation
A1 / A2
Auxiliary voltage
rotary switch tv:
0 ... 10 s
K / L1/i
Current path (current at phase L1)
Example
Response value: 5.2 kW
L1 / L2 / L3
Supply
11 / 12 / 14
Contacts relay 1
0,2 kW
21 / 22 / 24
Contacts relay 2
(only at MH 9397)
fine adjustment
(upper rotary switch):
Connection notes
The unit can also be used on single phase loads. the terminals L2 and L3
have to be bridged in this case. The device also switches at the set points
in the case of reverse power. Overload in the current path is indicated by
fast flashing of the LEDs.
Bereichswahl
(lower rotary switch):
0
0,3
P1
0,7
1
0 1 2
3
0
0,3
4
5 ... 6 5kW
8 7 6
0,7
1
0 1 2
3
4
5
8 7 6
kW
P1
kW
Geräteanschluss
Indication
The connection has to be done according to the connection diagrams. To
connect the motor current of L1 the terminals i and k are used.. For current
exceeding the limits of the device an additional current transformer has to
be used.
The LED indicate the state.
green LED, UN:
on, when auxiliary voltage present
green LED, P1:
flashes:
permanently on:
during time delay
Relay 1 active
(only at MH 9397)
green LED, P2:
flashes:
permanently on:
during time delay
Relais 2 active
Overload within the current range is indicated by fast flashing of the LED.
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Technical Data
Technical Data
Auxiliary Voltage A1 / A2
General Data
Nominal auxiliary voltage UH:
MK 9397N:
DC 24 V (0.9 ... 1.1 x UH)
MH 9397:
AC 230V (0.8 ... 1.1 x UH)
Nominal frequency:
50 / 60 Hz
Frequency range:
45 ... 400 Hz
Input current:
at DC 24V:
50 mA
at AC 230V:
15 mA
Nominal operating mode:
continuous operation
Temperature range:
- 20 ... + 60°C
Clearance and creepage distance
rated impulse voltage /
pollution degree:
4 kV / 2
high voltage test:
IEC/EN 60 664-1
EMC
Electrostatic discharge (ESD): 8 kV (air)
IEC/EN 61 000-4-2
HF irradiation:
10 V / m
IEC/EN 61 000-4-3
Fast transients:
2 kV
IEC/EN 61 000-4-4
Surge voltage
between
wires for power sypply:
1 kV
IEC/EN 61 000-4-5
between wire and ground:
2 kV
IEC/EN 61 000-4-5
HF-wire guided:
10 V
IEC/EN 61 000-4-6
Interference suppression:
Limit value class A
EN 55 011
Degree of protection:
Housing:
IP 40
IEC/EN 60 529
Terminals:
IP 20
IEC/EN 60 529
Housing:thermoplastic with VO behaviour
according to UL Subject 94
Vibration resistance:
Amplitude 0,35 mm
frequency 10 ... 55 Hz, IEC/EN 60 068-2-6
Climate resistance:
20 / 060 / 04
IEC/EN 60 068-1
Wire connection DIN 46 228-1/-2/-3/-4
Screw terminal
(fixed):
1 x 4 mm2 solid or
1 x 2.5 mm2 stranded ferruled (isolated) or
2 x 1.5 mm2 stranded ferruled (isolated) or
2 x 2.5 mm2 solid
Insulation of wires or
sleeve length:
8 mm
Terminal block
with screw terminals
Max. cross section:
1 x 2.5 mm2 solid or
1 x 2.5 mm2 stranded ferruled (isolated)
Insulation of wires or
sleeve length:
8 mm
Terminal block
with cage clamp terminals
Max. cross section:
1 x 4 mm2 solid or
1 x 2.5 mm2 stranded ferruled (isolated)
Min. cross section:
0.5 mm2
Insulation of wires or
sleeve length:
12 +0.5 mm
Wire fixing:
Plus-minus terminal screws M3,5 box
terminals with wire protection
or cage clamp terminals
Fixing torque:
0.8 Nm
Mounting:
DIN rail
IEC/EN 60 715
Weight:
360 g
Voltage Measuring Input L1 / L2 / L3
Nominal voltage UN:
Measuring range:
3 AC 400 V
3 AC 12 ... 400 V
Variants without auxiliary supply get their power from the measuring input.
The Voltage range of the Measuring voltage is then identical with the
range of the auxiliary supply.
Current Measuring Input i / k
Nominal current IN:
Measuring range:
Max. overload
continuously: short time < 10 s:
AC 12 A
AC 100 mA ... 12 A
16 A
max. 25 A
Overload within the current range is indicated by fast flashing of the LED.
Nominal frequency:
Frequency range:
50 / 60 Hz
45 ... 400 Hz
Setting range (at absolute scale)
Rel 1:
Range:
Rel 2:
Range:
Measuring accuracy
at nominal frequency
(in % of setting value):
Hysteresis
(in % of setting value):
Reaction time:
Time delay tv:
Start up delay:
fine adjustment
8 ranges 0 ... 8 kW
fine adjustment
8 ranges 0 ... 8 kW
± 4%
<5%
< 150 ms
0 ... 10 s adjustable
500 ms fixed
Output Circuit (Rel1: 11/12/14; Rel2: 21/22/24)
Contacts
MK 9397N:
1 changeover contact for P1
MH 9397:
1 changeover contact for P1 and
1 changeover contact for P2
Thermal current Ith:
2x4A
Switching capacity
to AC 15:
NO contacts:
3 A / AC 230 V
IEC/EN 60 947-5-1
NC contacts:
1 A / AC 230 V
IEC/EN 60 947-5-1
Electrical life
to AC 15 at 3 A, AC 230 V:
2 x 105 switch. cycl. IEC/EN 60 947-5-1
Permissible switching
frequency:1800 switching cycles / h
Short circuit strength
max. fuse rating:
4 A gL
IEC/EN 60 947-5-1
Mechanical life:
30 x 106 switching cycles
Dimensions
Width x height x depth:
MK 9397N:
MH 9397:
3
22.5 x 90 x 99 mm
45 x 90 x 99 mm
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Standard Types
Connection Example
MK 9397N.11/010 3 AC 24 ... 400 V AC 12 A DC 24 V 10 s
Article number:
0062043
• Measuring voltage:
3 AC 24 ... 400 V
• Measuring current:
AC 12 A
• Auxiliary voltage UH:
DC 24 V
• On delay:
up to 10 s
• Output:
1 changeover contact
• Width:
22,5 mm
L1
L2
L3
N
L
N
F
K
MH 9397.12/010 3 AC 24 ... 400 V AC 12 A AC 230 V 10 s
Article number:
0062046
• Measuring voltage:
3 AC 24 ... 400 V
• Measuring current:
AC 12 A
• Auxiliary voltage UH:
AC 230 V
• On delay:
up to 10 s
• Output:
1 changeover contact (Rel1) and
1 changeover contact (Rel2)
• Width:
45 mm
A1 A2 k
P1 11
P2
12 14
Ordering Example
L1/i L2 L3
21
MH9397
22 24
11 12 14 21 22 24
MK 9397N .11 _ _ /010 3 AC 24 ... 400 V AC 12 A DC 24 V 10 s
On delay
Auxiliary voltage UH
Measuring current UM
Measuring voltage
Type of terminals
without indication:
L1
terminal blocks fixed
L2
L3
with screw terminals
PC (plug in cage clamp):
pluggableterminalblocks
F
withcageclampterminals
PS (plug in screw):
pluggableterminalblocks
K
with screw terminals
Contacts
Type
M11179
M
3~
L
N
I
i
K
k
Options with Pluggable Terminal Blocks
A1 A2 k
P1 11
12 14
P2
L1/i L2 L3
21
MH9397
22 24
11 12 14 21 22 24
M11180
Screw terminal
(PS/plugin screw)
Cage clamp terminal
(PC/plugin cage clamp)
M
3~
Notes
Removing the terminal blocks with cage clamp terminals
1.
2.
3.
4.
The unit has to be disconnected.
Insert a screwdriver in the side recess of the front plate.
Turn the screwdriver to the right and left.
Please note that the terminal blocks have to be mounted on the
belonging plug in terminations.
Remark:
When using external current transformers the setting values have to be
multiplied with the transmission ratio ü of the current transformer.
Example: response value = setting value (P1/P2) x ü
E. DOLD & SÖHNE KG • D-78114 Furtwangen • PO Box 1251 • Telephone (+49) 77 23 / 654-0 • Telefax (+49) 77 23 / 654-356
e-mail: dold-relays@dold.com • internet: http://www.dold.com
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